let idTmr;
const getExplorer = () => {
    let explorer = window.navigator.userAgent;
    //ie
    if (explorer.indexOf("MSIE") >= 0) {
        return 'ie';
    }
    //firefox
    else if (explorer.indexOf("Firefox") >= 0) {
        return 'Firefox';
    }
    //Chrome
    else if (explorer.indexOf("Chrome") >= 0) {
        return 'Chrome';
    }
    //Opera
    else if (explorer.indexOf("Opera") >= 0) {
        return 'Opera';
    }
    //Safari
    else if (explorer.indexOf("Safari") >= 0) {
        return 'Safari';
    }
}

const method = (ref,name) => {

    //整个表格拷贝到EXCEL中
    if (getExplorer() == 'ie') {
        let curTbl = ref;
        let oXL = new ActiveXObject("Excel.Application");

        //创建AX对象excel
        let oWB = oXL.Workbooks.Add();
        //获取workbook对象
        let xlsheet = oWB.Worksheets(1);
        //激活当前sheet
        let sel = document.body.createTextRange();
        sel.moveToElementText(curTbl);
        //把表格中的内容移到TextRange中
        sel.select;
        //全选TextRange中内容
        sel.execCommand("Copy");
        //复制TextRange中内容
        xlsheet.Paste();
        //粘贴到活动的EXCEL中
        oXL.Visible = true;
        //设置excel可见属性

        try {
            let fname = oXL.Application.GetSaveAsFilename("Excel.xls", "Excel Spreadsheets (*.xls), *.xls");
        } catch (e) {
            print("Nested catch caught " + e);
        } finally {
            oWB.SaveAs(fname);

            oWB.Close(savechanges = false);
            //xls.visible = false;
            oXL.Quit();
            oXL = null;
            // 结束excel进程，退出完成
            window.setInterval("Cleanup();", 1);
            idTmr = window.setInterval("Cleanup();", 1);

        }

    } else {
        tableToExcel(ref,name)
    }
}

const Cleanup = () => {
    window.clearInterval(idTmr);
}

const tableToExcel = (function() {
    // 编码要用utf-8不然默认gbk会出现中文乱码
    let uri = 'data:application/vnd.ms-excel;base64,',
        template = '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40"><head><meta charset="UTF-8"><!--[if gte mso 9]><xml><x:ExcelWorkbook><x:ExcelWorksheets><x:ExcelWorksheet><x:Name>{worksheet}</x:Name><x:WorksheetOptions><x:DisplayGridlines/></x:WorksheetOptions></x:ExcelWorksheet></x:ExcelWorksheets></x:ExcelWorkbook></xml><![endif]--></head><body><table>{table}</table></body></html>',
        base64 = function(s) {
            return window.btoa(unescape(encodeURIComponent(s)));
        },
        format = (s, c) => {
            return s.replace(/{(\w+)}/g,
                (m, p) => {
                    return c[p];
                })
        }
    return (table, name) => {
        let ctx = {
            worksheet: name,
            table
        }

        //创建下载
        let link = document.createElement('a');
        link.setAttribute('href', uri + base64(format(template, ctx)));
        link.setAttribute('download', name);

        // window.location.href = uri + base64(format(template, ctx))
        link.click();
    }
})()

export default (theadData, tbodyEle, dataname = 'Worksheet') => {
    // 写入key过滤不显示的td
    let thArr = [];
    // 建立节点
    let table = document.createElement('table');
    let thead = document.createElement('thead');
    let tbody = tbodyEle.$el.getElementsByClassName('ivu-table-tbody')[0].cloneNode(true);

    //  建立thead中的tr
    let thTr = document.createElement('tr');
    //  遍历写入th表头
    for(let i of theadData){
        thArr.push(i.key);
        let th = document.createElement('th');
        let text = document.createTextNode(i.title);
        th.appendChild(text);
        thTr.appendChild(th);
    }

    thead.appendChild(thTr);
    table.appendChild(thead);
    table.appendChild(tbody)
    console.log(table)
    method(table.innerHTML, dataname);
}
